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#R_%!PP!PP!PPZ!Z!V @!PgB5J!Z!!0!!&{F&!""!&.!,PhJT}PPP!!"" "" Soil-Structure Interaction (SSI) Research Project
INCLUDEPICTURE "http://www.engineering.manhattan.edu/civil/CGT/graphics/CGT_logo.gif" \* MERGEFORMATINET HYPERLINK "http://www.engineering.manhattan.edu/civil/CGT/RDssi.html" http://www.engineering.manhattan.edu/civil/CGT/RDssi.html
"Make things as simple as possible but no simpler."
"Simplicity that is based on rationality is the ultimate sophistication."
- attributed to Albert Einstein (1879-1955)
Project Overview
Soil-structure interaction (SSI) foundation problems are those where an acceptable problem solution must consider the forces and deformations of the foundation element and soil/rock subgrade together in one analysis. Contrary to some perceptions, SSI problems are not limited to seismic loading although this is a major area of SSI application.
The number and variety of SSI problems has increased significantly over the years as a result of:
a greater awareness and concern for seismic loading,
foundation and material innovation, and
the increase in computational power available from computers for routine problem solving.
Thus the need and possibilities for research into SSI problems are greater than ever.
HYPERLINK "http://www.engineering.manhattan.edu/civil/faculty/horvath/horvath.html" Prof. John S. Horvath, Ph.D., P.E. of the Manhattan College Civil Engineering Department has been involved in SSI research since his doctoral studies during the 1970s which derived from his dissatisfaction with the often confusing and contradictory interpretations given to the subject of HYPERLINK "http://www.engineering.manhattan.edu/civil/CGT/T2olrssi01.html" subgrade reaction. He continued this research when he came to the College in 1987. His initial research involved subgrade models for mat (raft) foundations. Throughout the 1990s the focus shifted to earth retaining structures and the use of HYPERLINK "http://www.engineering.manhattan.edu/civil/CGT/T2olrgeofoam.html" geofoam compressible inclusions for HYPERLINK "http://www.engineering.manhattan.edu/civil/CGT/T2olrssi02.html" controlled yielding behind relatively rigid and non-yielding structures. This work utilized information developed during the CGT HYPERLINK "http://www.engineering.manhattan.edu/civil/CGT/RDgeomat.html" Geomaterials Research Project that was very active during the same time frame.
Future SSI research will continue to pursue applications of the controlled yielding concept using geofoam HYPERLINK "http://www.engineering.manhattan.edu/civil/CGT/T2olrcellf&a1.html" compressible inclusions. However, there will be a return to considering some of the broader applications of SSI concepts, including mat foundations.
Project Tasks
Because of Prof. Horvath's long-time interest in the topic of SSI, specific problems investigated over the years have covered a wide variety of problems of practical interest:
evaluation of subgrade models for mats and related foundation elements such as base slabs for cut-and-cover tunnels,
investigation of the behavior of several different types of earth retaining structures and anchored foundations to evaluate the difference between results obtained using conventional manual calculation procedures versus numerical solution based on the finite-element method as applied to a continuum,
fundamental study of the concept of controlled yielding to reduce earth pressures using the compressible-inclusion function of geofoams,
an preliminary assessment of potential design alternatives to improve the behavior of integral abutment bridges ( HYPERLINK "http://www.engineering.manhattan.edu/civil/CGT/T2olrssi03.html" click here to read the executive summary of the research report prepared for this project) and
development of a simple analytical model that can be used for more-accurate design of various types of foundations secured against uplift using ground anchors.
Results from most of these tasks were published as contributions to the now-defunct Manhattan College Civil Engineering Department CE/GE research report series and some of these reports are still available in digital format (see below). This work has now continued under the CGT. In addition, the On-Line Resources section of the CGT Technology Transfer activity contains some short, descriptive discussions that take a fresh look at various issues concerning the analysis and design methods used for many traditional earth retaining structure problems. Examples include as HYPERLINK "http://www.engineering.manhattan.edu/civil/CGT/T2olrssi06.html" at-rest lateral earth pressures, HYPERLINK "http://www.engineering.manhattan.edu/civil/CGT/T2olrssi05.html" cantilever retaining walls, HYPERLINK "http://www.engineering.manhattan.edu/civil/CGT/T2olrssi07.html" modern (bin-type) retaining walls and HYPERLINK "http://www.engineering.manhattan.edu/civil/CGT/T2olrssi04.html" anchored bulkheads.
Future tasks to be conducted under the auspices of the CGT will include:
an updated and expanded look at the many aspects and applications of subgrade modeling, including the innovative HYPERLINK "http://www.engineering.manhattan.edu/civil/CGT/T2olrssi08.html" piled-raft concept and the complex problem of HYPERLINK "http://www.engineering.manhattan.edu/civil/CGT/T2olrssi09.html" tanks-on-grade.
further development of the concept of controlled yielding using geofoam HYPERLINK "http://www.engineering.manhattan.edu/civil/CGT/T2olrcellf&a1.html" compressible inclusions. This is a greatly underutilized concept that has potential application for a wide variety of structures under many different ground and loading conditions.
Project Reports
The following research reports have been produced for the SSI Research Project to date. Please note that reports without a clickable link are out of print and not available through any means, including inter-library loan. However, abstracts of some material from out-of-print reports can be found in published papers available through normal sources (see the list below):
HYPERLINK "http://www.engineering.manhattan.edu/civil/CGT/pubs/cgt200202.pdf" "Soil-Structure Interaction Research Project - Basic SSI Concepts and Applications Overview" by John S. Horvath, Report No. CGT-2002-2, August 2002
HYPERLINK "http://www.engineering.manhattan.edu/civil/CGT/pubs/cgt200103.pdf" "Soil-Structure Interaction Research Project - Analysis of Vertically Anchored Foundation Elements" by John S. Horvath, Report No. CGT-2001-3, June 2001
HYPERLINK "http://www.engineering.manhattan.edu/civil/CGT/pubs/cege002.pdf" "Integral-Abutment Bridges: Problems and Innovative Solutions Using EPS Geofoam and Other Geosynthetics" by John S. Horvath, Report No. CE/GE-00-2, May 2000
HYPERLINK "http://www.engineering.manhattan.edu/civil/CGT/pubs/cege982.pdf" "The Compressible-Inclusion Function of EPS Geofoam: Analysis and Design Methodologies" by John S. Horvath, Report No. CE/GE-98-2, April 1998
HYPERLINK "http://www.engineering.manhattan.edu/civil/CGT/pubs/cege981.pdf" "The Compressible-Inclusion Function of EPS Geofoam: An Overview of Concepts, Applications, and Products" by John S. Horvath, Report No. CE/GE-98-1, March 1998
"Subgrade Modeling for Soil-Structure Interaction Analysis of Horizontal Foundation Elements" by John S. Horvath, Report No. CE/GE-93-1, January 1993
"Developments in Thick-Geosynthetics Technology: 1991 Update" by John S. Horvath, Report No. CE/GE-91-1, December 1991
"A Theoretical Study of the Effect of Anchors on the Performance of Shallow Foundations Under Vertical Loads" by John S. Horvath, Report No. CE/GE-90-3, August 1990
"The Use of Geosynthetics to Reduce Lateral Earth Pressures on Rigid Walls; Phase I: Concept Evaluation" by John S. Horvath, Report No. CE/GE-90-2, July 1990
"A Study of Some Miscellaneous Wall Problems" by John S. Horvath, Report No. CE/GE-90-1, June 1990
"Base Pressure and Earth Pressure Measurements - Nrnberg Subway" by John S. Horvath, Report No. CE/GE-89-1, June 1989
"Historical Review and Critique of Mathematical Models for Plate- and Beam-Type Foundation Element Subgrades" by John S. Horvath, Report No. CE/GE-88-4, July 1988
"Determination of the Coefficient of Subgrade Reaction, k, for Beams" by John S. Horvath, Report No. CE/GE-88-3, June 1988
"Further Evaluation of the Coefficient, or Modulus, of Subgrade Reaction, k, Using an Extension of Reissner's Simplified Elastic Continuum Concept" by John S. Horvath, Report No. CE/GE-88-2, May 1988
"Numerical Analysis of Beams and Beam-Columns with Linear and Non-Linear Spring Supports Using Finite Differences" by John S. Horvath, Report No. CE/GE-88-1, February 1988
Other Publications
The following publications are available from traditional sources (published journals, etc. but not the CGT or Prof. Horvath). They contain abstracts of material from out-of-print Manhattan College CE/GE-series reports as well as the results of research and consulting performed by Manhattan College faculty and research performed by Manhattan College graduate students that is related to the SSI Research Project:
Horvath, J. S., "Controlled yielding using geofoam compressible inclusions: the new frontier in earth-retaining structures", IeC GEO3 - International e-Conference on Modern Trends in Geotechnical Engineering: Geotechnical Challenges and Solutions, hosted by the Indian Institute of Technology at Madras, September 2003 [available via the Internet at www.ecfg.iitm.ac.in, HYPERLINK "http://www.ecfg.iitm.ac.in/" click here to access the conference website].
Murphy, G. P., "The influence of geofoam creep on the performance of a compressible inclusion", Geotextiles and Geomembranes, Elsevier Science Ltd., 1997.
Horvath, J. S., "Subgrade modeling for mat foundations: a review and critique of analytical methods", Special Publication No. 152, American Concrete Institute, 1995.
Horvath, J. S., "Cut-and-cover tunnel subgrade modeling", Transportation Research Record No. 1415, Transportation Research Board, 1993.
Horvath, J. S., "Beam-column-analogy model for soil-structure interaction analysis", Journal of Geotechnical Engineering, American Society of Civil Engineers, February 1993.
Horvath, J. S., "Using geosynthetics to reduce surcharge-induced stresses on rigid earth retaining structures", Transportation Research Record No. 1330, Transportation Research Board, 1991.
Horvath, J. S., "Effect of footing shape on behavior of cantilever retaining wall", Journal of Geotechnical Engineering, American Society of Civil Engineers, June 1991.
Horvath, J. S., "Using geosynthetics to reduce earth loads on rigid retaining structures", Conference Proceedings - Geosynthetics '91, Industrial Fabrics Association International, 1991.
Horvath, J. S., "Subgrade models for soil-structure interaction analysis", Foundation Engineering: Current Principles and Practices, American Society of Civil Engineers, 1989.
Horvath, J. S., "Simplified elastic continuum applied to the laterally loaded pile problem - part I: theory", Laterally Loaded Deep Foundations: Analysis and Performance, American Society for Testing and Materials, 1984.
Horvath, J. S., "A new subgrade model applied to mat foundations", Journal of Geotechnical Engineering, American Society of Civil Engineers, December 1983.
Horvath, J. S., "The modulus of subgrade reaction: a new perspective", Journal of Geotechnical Engineering, American Society of Civil Engineers, December 1983.
Horvath, J. S. and Dette, J. T., "Rehabilitation of failed steel-sheetpile bulkheads", Proceedings of the Specialty Conference on Port Modernization, Upgrading and Repairs, American Society of Civil Engineers, 1983.
Use your browser's BACK button to return to the page you came here from or HYPERLINK "http://www.engineering.manhattan.edu/civil/CGT.html" click here to return to the CGT homepage.
This page was last revised on 1 July 2003.
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